Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000,2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
| 18 | #ifndef __XFS_ALLOC_BTREE_H__ |
| 19 | #define __XFS_ALLOC_BTREE_H__ |
| 20 | |
| 21 | /* |
| 22 | * Freespace on-disk structures |
| 23 | */ |
| 24 | |
| 25 | struct xfs_buf; |
| 26 | struct xfs_btree_cur; |
| 27 | struct xfs_btree_sblock; |
| 28 | struct xfs_mount; |
| 29 | |
| 30 | /* |
| 31 | * There are two on-disk btrees, one sorted by blockno and one sorted |
| 32 | * by blockcount and blockno. All blocks look the same to make the code |
| 33 | * simpler; if we have time later, we'll make the optimizations. |
| 34 | */ |
| 35 | #define XFS_ABTB_MAGIC 0x41425442 /* 'ABTB' for bno tree */ |
| 36 | #define XFS_ABTC_MAGIC 0x41425443 /* 'ABTC' for cnt tree */ |
| 37 | |
| 38 | /* |
| 39 | * Data record/key structure |
| 40 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 41 | typedef struct xfs_alloc_rec { |
| 42 | __be32 ar_startblock; /* starting block number */ |
| 43 | __be32 ar_blockcount; /* count of free blocks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | } xfs_alloc_rec_t, xfs_alloc_key_t; |
| 45 | |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 46 | typedef struct xfs_alloc_rec_incore { |
| 47 | xfs_agblock_t ar_startblock; /* starting block number */ |
| 48 | xfs_extlen_t ar_blockcount; /* count of free blocks */ |
| 49 | } xfs_alloc_rec_incore_t; |
| 50 | |
| 51 | /* btree pointer type */ |
| 52 | typedef __be32 xfs_alloc_ptr_t; |
| 53 | /* btree block header type */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | typedef struct xfs_btree_sblock xfs_alloc_block_t; |
| 55 | |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 56 | #define XFS_BUF_TO_ALLOC_BLOCK(bp) ((xfs_alloc_block_t *)XFS_BUF_PTR(bp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | * Minimum and maximum blocksize and sectorsize. |
| 60 | * The blocksize upper limit is pretty much arbitrary. |
| 61 | * The sectorsize upper limit is due to sizeof(sb_sectsize). |
| 62 | */ |
| 63 | #define XFS_MIN_BLOCKSIZE_LOG 9 /* i.e. 512 bytes */ |
| 64 | #define XFS_MAX_BLOCKSIZE_LOG 16 /* i.e. 65536 bytes */ |
| 65 | #define XFS_MIN_BLOCKSIZE (1 << XFS_MIN_BLOCKSIZE_LOG) |
| 66 | #define XFS_MAX_BLOCKSIZE (1 << XFS_MAX_BLOCKSIZE_LOG) |
| 67 | #define XFS_MIN_SECTORSIZE_LOG 9 /* i.e. 512 bytes */ |
| 68 | #define XFS_MAX_SECTORSIZE_LOG 15 /* i.e. 32768 bytes */ |
| 69 | #define XFS_MIN_SECTORSIZE (1 << XFS_MIN_SECTORSIZE_LOG) |
| 70 | #define XFS_MAX_SECTORSIZE (1 << XFS_MAX_SECTORSIZE_LOG) |
| 71 | |
| 72 | /* |
| 73 | * Block numbers in the AG: |
| 74 | * SB is sector 0, AGF is sector 1, AGI is sector 2, AGFL is sector 3. |
| 75 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #define XFS_BNO_BLOCK(mp) ((xfs_agblock_t)(XFS_AGFL_BLOCK(mp) + 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | #define XFS_CNT_BLOCK(mp) ((xfs_agblock_t)(XFS_BNO_BLOCK(mp) + 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | /* |
| 80 | * Record, key, and pointer address macros for btree blocks. |
Christoph Hellwig | 136341b | 2008-10-30 17:11:40 +1100 | [diff] [blame^] | 81 | * |
| 82 | * (note that some of these may appear unused, but they are used in userspace) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | */ |
Christoph Hellwig | 136341b | 2008-10-30 17:11:40 +1100 | [diff] [blame^] | 84 | #define XFS_ALLOC_REC_ADDR(mp, block, index) \ |
| 85 | ((xfs_alloc_rec_t *) \ |
| 86 | ((char *)(block) + \ |
| 87 | sizeof(struct xfs_btree_sblock) + \ |
| 88 | (((index) - 1) * sizeof(xfs_alloc_rec_t)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Christoph Hellwig | 136341b | 2008-10-30 17:11:40 +1100 | [diff] [blame^] | 90 | #define XFS_ALLOC_KEY_ADDR(mp, block, index) \ |
| 91 | ((xfs_alloc_key_t *) \ |
| 92 | ((char *)(block) + \ |
| 93 | sizeof(struct xfs_btree_sblock) + \ |
| 94 | ((index) - 1) * sizeof(xfs_alloc_key_t))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Christoph Hellwig | 136341b | 2008-10-30 17:11:40 +1100 | [diff] [blame^] | 96 | #define XFS_ALLOC_PTR_ADDR(mp, block, index, maxrecs) \ |
| 97 | ((xfs_alloc_ptr_t *) \ |
| 98 | ((char *)(block) + \ |
| 99 | sizeof(struct xfs_btree_sblock) + \ |
| 100 | (maxrecs) * sizeof(xfs_alloc_key_t) + \ |
| 101 | ((index) - 1) * sizeof(xfs_alloc_ptr_t))) |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 102 | |
| 103 | extern struct xfs_btree_cur *xfs_allocbt_init_cursor(struct xfs_mount *, |
| 104 | struct xfs_trans *, struct xfs_buf *, |
| 105 | xfs_agnumber_t, xfs_btnum_t); |
Christoph Hellwig | 60197e8 | 2008-10-30 17:11:19 +1100 | [diff] [blame] | 106 | extern int xfs_allocbt_maxrecs(struct xfs_mount *, int, int); |
Christoph Hellwig | 561f7d1 | 2008-10-30 16:53:59 +1100 | [diff] [blame] | 107 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #endif /* __XFS_ALLOC_BTREE_H__ */ |